Piston.



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2 SHEETEPSHEET l.

H. G. KING.

PISTON.

APPLICATION I'ILED FEB. 2, 1912,

` Patented July m3.

2 BHEBTFaL-SIIBBT'Z,

H'EIRB.lViirLClI' G. KING, F EL PASO, TEXAS.

PISTON.

Specification of Letters Patent.

Patented July. 2 2, 1913.

.application tiled February 2, 1912. Serial No. 674,858.

To all whom, t may concern:

lie it known thatl l, HERBERT G. KING, a citizen of the United States, residing at El Paso, in the county of lill Paso and State of Texas, have invented new and useful lmprovements in Pistons, of which the following is a specification.

rlhis invention relates to certain novel and useful improvements in pistons and has particular application to a piston 4adapted especially to be employed in connection with the cylinders of, air brakes.

ln carrying out my invention, it is my purpose. to provide a piston having a novel form of piston head provided with a follower and'suitable packing, the construction and arrangement of the parts being such that upon the admission of air to the cylinder, the follower will be forced tightly and firmly against the piston packing.

Still ano-ther obJect of my invention is to provide a piston head of the type described wherein the follower and packing may be easily applied thereto, and removed therefrom quickly and with facility to enable lthe old packing to'be discarded and a new one placed in use.

l also aim to provide a piston head having a packing formed of asbestos or other similar material, so that it will not be necessary to frequently remove the packing as is the case where such packing is composed of leather or other material which is peculiarly susceptible to disintegration or wear.

A. further object of my invention is to provide an'improved piston embodying the desired wfeatures of simplicity, durability, efficiency and economy in the cost 4of manufacture.

With the above-recitedobjects, and others of a similar nature in view, the invention consists in the construction, combination and arrangement of parts, set forth in and falling within the scope of the appended claims. l ln the accompanying drawing: Figure 1 is a longitudinal sectional view, taken through a cylinder provided with a piston embodying my invention. Fig. 2 is a vertical sectional view, taken through the same. Fig. 3 is a view in side elevation of a slightly modified form of piston arrangement. Fig. t is a vertical longitudinal view taken through a cylinder and piston such as is shown in Fig. 3.

Referring to the. accompanyingdrawingsin detail, and especially to Figs. 1 and Q, the

ltensioning the same to force the piston back toward the upper end of the cylinder when the air is released from the cylinder. The numeral 7 indicates myimproved follower i adapted to lit over the iston body, the fol lower having a circum erentially extending flange 8 adapted to loosely tit over the piston body, the end of said flange being beveled as at 9, and shouldered as at 10 for the purpose now to be described.

Between the end of the flange shoulder 10 and the flange 4 is adapted to be placed a removable packing which is preferably formed of asbestos and in the present instance is made up of three ring-like members 11, 12 and 13, each ring member being formed of two or more sections, the ring member 1l, being ap roximately triangular in cross section an is adapted to bear against the flange 4, the inclined face 1,4 of

the 'member 11 contacting with the similarly inclined face 15 ofn the member 12 which is also triangular in cross section. The vertical face 16 of the packing ring 12 bears against the correspondingly vertical base 17 of the packing ring 13, the inclined face 18 of this last ring 13 bearing against the beveled face of the follower head.

By constructing the packing asl shown, it will be noted lthat l obtain a wedging effect between the follower head, the piston flange and the wall of the cylinder.

At the endfof the cylinder adjacent to the air pipe is arranged a spring 1l) adapted when the air is released from the cylinder and the piston is at the forward end of such cylinder, to contact with the follower head. and force the latter hack on the pistonhead so as to bind the packing securely in position and also to press such packing ontvf'ard against the walls of the cylinder. For instance, shonld the piston and follower be in a position at the extreme left of the cylinder` in Fig. l, the spring 19 will he compressed so that, in the event that the piston is jerked or moved quickly toward the righthand end of the cylinder, the spring will react and llO cause the flange 8 of the follower to coact with the flange t on the piston body to expand the packing rings, thus forming a fluid tight joint.

From the above description, taken in connection with the accompanying drawing, the construction and manner of employing my invention will be readily apparent.

lVhen air is .admitted through 'the pipe 2 to the cylinder the pressing of the air against the follower Ahead forces the latter back upon the piston head thereby binding the packing and forming an airtight joint between the piston and the walls of the cylinder, thus preventing the escape of air. Upon the releasing of the air from the cylinder through the pipe 2, the spring 6 forces the piston forward until the latter contacts with the spring 19 and the latter presses the follower head into engagement with the piston.

In Figs. 3 and 4;, I.have shown a slightly modified form of piston, wherein the numeral 20 indicates the cylinder, while 2l is the piston rod carrying the solid follower head 22, the latter` having the corrugated flanged face 23, for the purpose hereinafter described. The numeral 24 indicates the follower head provided with the flange 25 while 2G indicates the corrugated or grooved face of the flange which is similar to the face 23, the follower head having an out'-A wardly extending circumferential flange 2G fitting over the head of the piston. tween the faces 23 and 26 is formed a space for the reception of the packing 27, the corrugations or grooves assisting in retaining the packing in place. The numeral 28 designates a cap covering the adjusting screw 29 leading to the follower while 30 indicates an adjusting unit to which a wrench is applied to contract and lap the packing as needed,

It will be noted that I have provided a simple yet eflicient form of piston which may be employed in connection with any cylinder,l but which is especially adapted for use in connection With air brake cylinders, the brake levers being adapted to be connected to the piston head.

While I have herein shown and described one particular embodiment of my invention, I wish it to be understood that I do not confine myselfI to al]V the precise details of construction hereinl set` forth, as modification and variation may be made without departing from the spirit o'f the invention or exceeding the scope of the appended claims.

- I claim 1. The combination with a cylinder, of

a piston adapted to reciprocate-therein and having the body thereof formed at one end with a circumferential flange, a follower within the cylinder separate from the piston therein ,and provided `with a circumferenwith a circumferential flange, a followerl within the cylinder separate from the piston therein and provided with a circumferentially extending flange adapted to loosely fit over the side -of the piston body, packing rings interposed between the free ends of the last-mentioned flange and the flange on said piston body whereby upon the admission oflluid to the cylinder the follower will be acted upon insuch manner as to expand the packing rings and so effect a fluid tight joint, and a spring within the cylinder and adapted to cont-act with the follower head when the fluid is exhausted from the cylinde-r, whereby the packing rings will be expanded.

The combination with a cylinder, of a solid lpiston moving therein and having the bodythereof formed with a circumferential flange, a follower within the cylinder Separate from the piston therein and provided with a circumferentially extending flange fitting over the piston body and moving automatically relatively thereto, and packing material located between the adjacent end of the follower and the flange on the piston body and normally held in .binding engagement `with the inner walls of the cylinder by means of said follower.

l. The combination with a cylinder, of a pist-on therein, a follower within the cyl,- inder separate from the piston therein and movable automatically relatively to the piston, and packing interposed betweenY the follower and piston and adapted to bind against the adjacent wall of the cylinder under the action of said follower.

In testimony whereof I affix my signature in presence of two witnesses.

HERBERT G. KING.

Witnesses:

A. F. CoDINGToN, W. B. HUNTER.

ion 

